Coil former



- 'Ap 1927. v

' 1,623,766 A. 0. WAY I V COIL FORMER Filed u 11. 1922 g- Ifiveritor: ALva QWag,

I by His ub e Patented Apr. 5, 1927.

j UNITED STATES I 1,623365 PATENT orries.

I ALVA, 0. war, or soHENEcr'AnY, NEW YORK, ASSIGNOR T GENERAL ELECTRIC conl I'ANY, A conroaarron or New YORK. 1

I COIL FORMER.

-App1ication filed August 11, 1922. Serial N9. 581,117.

The present invention relates to means for forming and shaping, metal strips or ribbons into edge-wound coils orhelixes having integral flangesat the inner edges thereof whereby they are adapted to be attached to pipes in the manufacture of heat radiators andkindred apparatus.

Heretofore it has been the custom to form such an edge-wound coil from the metal ribbon by drawing it through a die adapted to press u on and frictionally engagethe entire pro le of the ribbon during its passage therethrough. On account of the great amount of friction involved, the ribbon ,was

- injuriously stretched and the dies 'quickly worn out;

' The object of my invention is the pro-.

vision of an improved coil former in which the metal strips may be longitudinally folded or flanged and coiled edgewisewithout excessive stretching of the material and which may be subjected to high speed operation without injury to itself orthe product. One embodiment of the invention is shown 2 in the accompanying drawing forming a part of this specification in which Figure 1 is a side elevation of a portion'ofa' winding lathe with a coil former embodying my invention mounted thereon; Fig. 2 is a perspective view of the coil former with a metal ribbon in the process of being longitudinally folded and coiled edgewise;- Fig. 3

r is a vertical section of the former through the coiling end thereof; Fig. 4 is a similar 5 section through the leading or starting pair of folding rollers, and Fig. 5 is a side elevation of a distended section of coil made in the former. 1 g v In the arrangement shown in the drawing, the metal strip 1 is led throughthe former 2 and coiled into its permanent position upon a mandrel or tube 3. The mandrels or tubes 3' ai'ecoupled at their loading (or as shownthe left-hand) ends to the positively driven? head 4' of the winding lathe, while the other ends'are' supported freely in a bracket 5 of thelathe. is fastened to theside of the lathe carriage 61movable longitudinally. of the lathe bed.-

r I? The former 2' comprises an oblong bearing .block having a transverse guide aperture 7 near'oneend for the winding mandrel or tube 3 to pass freely theret-hrough. Extending rearwardly from thevformer and in 58, alignment with the aperture 7 is-a-"mandrel folding or Hanging rolls 13- 14 and l5-l'6.

its bottom edge projecting beyond-the pe- The former 2 i or tube holder 8 adapted ,to extend through the lathe carriage 6 and be rigidly connected thereto. The former has its end opposite the transverse aperture 7 bifurcated'to form lugs 10 spaced for receiving between them i a grooved guide roller 11 for the metal ribbon 1 and carrying the: shaft 12 therefor.

I Arranged centrally along one side of the former are two pairs of frictionless ribbon The upper or steadying roll 13- of the leading 'pair is made in two parts 13 and 13 connected together by a central collar 17 on one part tightlyengaging a recess in'the other part and operating to space apart their adjacent ends and thus forming in effect a grooved roll through which a metal ribbon '1' may be freely passed edgewise with its top edge in contact with the collar 17 and riphery a distance corresponding to the we Width of the flange to be formed. The roll 13 is journailed on a shaft bolt 18 passing through the former block and the inner part. 13" is countersunk in a recess 19 so that its outer end is substantially flush with thesurface ofthe former and anti-friction .balls are disposed between the inner end thereof and the wullof the recess 19. The lower roll 14; of the leading pair has its periphery made conical with the larger diameter adja cent the face of the former so that the por-' tion 20 of the metal ribbon 1 that projects below. the periphery of the upper roll 13 will be bent over through a relatively small an- 90 gle according to the angularity of the conribbon 1. a Beyond the second pair of flanging rolls the former is provided with a coiling roll 22 which serves to' support themain portion of the'metal ribbon during the edgewise bending thereof about the mandrel 3. The coil- 1 ing roll 22' has an extended hub 23 journalled on a'shaft bolt 24-carried by a pressure bar 25 vertically adjustable in a transverse notch 26 in the former block 2 by means of a thumb screw 27 carried byacross bar 28.

In order to relieve the inner surface of the metal ribbon of frictiofi during the coiling thereof, a free ring 29 is inserted in a recess about the outer end of the aperture 7 with anti-friction balls at the inner side and held in lace bya set screw 30 engaging a periphera groove therein. I

For the purpose of uniformlyspacing the convolutions of the coil and also for preventing buckling of the ribbon as it leaves the coiling roll 22, a spacing finger 31 is attached to the face of the former block 2 just beyond the coiling roll 22 by a set screw 32, and toretain the ribbon in contact with the guide roller 11 as it passes to the leading flang'ing rolls 13' and 14:, a guide bracket 33 is fastened across the lugs 10 to bridge the path of the ribbon.

' In order to introduce 'a metal ribbon into the former the edge adjacent the end is trimmed off so that it ma pass the flanging and coiling rolls freely. to the mandrel as by grip ing thereon by the coupling of the lathe hea 4 and upon applying power to the latter the ribbon will be drawn through the former, insuring the flangin and coiling thereof in the manner intended without further attention on the part of the operative, .except the supplying of suitable lubricant which may be accomplished by means of a nozzle 34 mounted on the lathe carria e 6.

While I have s own and described the best embodiment of the invention known to me, I do.not desire to be restricted thereto.

What I claim as new and desire to secure by Letters Patent of the United States, is

1. A former for producing flanged edgewound coils from metal ribbon comprising pairs of rolls for supporting and flanging the metal ribbon, and rolling contact means my hand this 8th day of August, 1922- for guidin and staying'the flanged ribbon on both si es during winding thereof.

he .end is attached 2. A former for producin flanged edgewound coils from metal rib on comprising pairs of rolls for supporting and (pro essively flanging the metal ribbon, an ro ling contact means for guiding and staying the flanged ribbon on both sides during winding thereof.

3 A former for producing flanged edgewound coils from metal ribbon comprising a bearing block having a guide passage for a mandrel, a mandrel, a grooved roll journalled on said block and adapted to support the ribbon, a second roll journalled on said block adjacent the said grooved roll and operating to flange the ribbon as it passes between said rolls to the mandrel, and a third 'roll journalled on said block adjacent to the said guide passage and operating to stay the flanged ribbon during winding thereof.

4. A former for producing edge-wound coils from metal ribbon comprising a hearing block having a guide passage for a mandrel, a mandrel, a freely rotatable ring arranged concentrically of said guide passage atone end thereof and adapted to engage one side of the ribbon during winding thereof, and a guiding and staying roll 'journallcd adjacent said guide passage and adapted to engage the o posite side of the ribbon during winding thereof.

5. A former for producingedge-wound coils from metal ribbon comprising a bearing block havin a guide passage for a mandrel, a man rel, a rotatable ring arranged concentrically of said guide passage at one end thereof and adapted to engage the inner side of the ribbon during winding thereof, means for flanging said ribbon,

and a gulding and staying roll ournalled adjacent said guide passage and adapted to engage the outer side offlange during ivindin thereof.

In witness whereo I have hereunto set aid ribbon. and its 

